Schneider Electric Modicon Quantum Safety 651 60S, Quantum Safety 671 60S, 140 CPU 651 60S, 140 CPU 671 60S, 140 SDI 953 00S, 140 DDI 353 00, 140 SDO 953 00S, 140 DDO 353 00, 140 SAI 940 00S, 140 ACI 040 00 Safety Reference Manual

Redundant CPU and I/O Configuration
The following figure shows an example of a Quantum Safety PLC consisting of
redundant CPUs and redundant I/Os:
The following figure provides the appropriate functional overview:
NOTE: Schneider Electric recommends always placing redundant Safety I/O
modules in different RIO drops.
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